100 Year Starship Management group picked

The Pentagon's think tank has selected the group that will manage its 100 Year Starship project to explore what it would take for a multigenerational mission beyond the solar system, and sources say the leader will be Mae Jemison, who became the first black woman in space in 1992.
In the 20 years since then, Jemison has founded several ventures — including The Jemison Group, a technology design and consulting company; and the Houston-based Dorothy Jemison Foundation for Excellence, which takes on educational projects. Jemison, a 55-year-old Alabama native who has experience as a physician and a Peace Corps worker as well as an astronaut, played a prominent role in facilitating the 100 Year Starship symposium organized by NASA and the Pentagon's Defense Advanced Research Projects Agency in Florida last fall

This would provide 598,000 m/s exhaust velocity. This alone would allow a trip to 10,000 AU in 50 years. Couple this with DUMBO NTR to get most of its useful life extra-solar--NOW you have a souped up New Horizons.